Magnetic core



FIG. 1 is a front elevation view of a magnetic core, showing our new design;

FIG. 2 is a back elevation view thereof;

FIG. 3 is a left side elevation view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a top, back, left side perspective view thereof. 

CLAIM The ornamental design for a magnetic core, as shown and described. 